Altamount Viaduct, CA, USA

Seismic Upgrading - Retrofitting of Bridges

Thirteen pier cap beams of this 440 m long bridge were retrofitted with twin-tierod groups connecting each side of the steel cap beam end to a new anchoring block. Tie rods that consist of Ø36 mm DYWIDAG Bars (THREADBAR®) and that are placed inside galvanized steel pipes run inclined from the anchoring block to a special steel "shoe" bracket fixed end. After a small post-tensioning force was applied at the anchorages, the tie rods were cement grouted.